/Engine/Source/Editor/SkeletalMeshEditor/Public/SkeletalMeshEditorSubsystem.h
Get number of sections for a LOD of a Skeletal Mesh
Number of sections. Returns INDEX_NONE if invalid mesh or LOD index.
int32 GetNumSections ( [USkeletalMesh](API\Runtime\Engine\Engine\USkeletalMesh) * SkeletalMesh, int32 LODIndex )